Excel in multiple formats
The question would need clarification. I'm new here so I will try to give an answer.
The easiest way would be to prepare the data in comma separated values (CSV). It is possible to export your data in this format from excel.
For downstream applications it will depends what programming language is used but in general it is possible to import CSV files and the data they contain for training (example panda data frame in python).

Hope this helps!